Originally Posted By: wemay
What viscosity is required for warranty purposes?
The 502 spec is usually met with a 5w40 or 0w40 oil, and some heavy 0w30 oils also work.
You can get Mobil 1 0w40 at Walmart cheaply every day
Sometimes Advance or Autozone will have a buy 5qt Castrol Synthetic (you can use their 0w40, 5w40, or European formula 0w30) and get a filter free, and that sometimes is a better deal because some VW engines have more expensive filters than ones used on American and Japanese cars.
I am using the Castrol 0w40 in my car, it seems to work well.